23=x+2x(x+3)

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Solution for 23=x+2x(x+3) equation:


Simplifying
23 = x + 2x(x + 3)

Reorder the terms:
23 = x + 2x(3 + x)
23 = x + (3 * 2x + x * 2x)
23 = x + (6x + 2x2)

Combine like terms: x + 6x = 7x
23 = 7x + 2x2

Solving
23 = 7x + 2x2

Solving for variable 'x'.

Reorder the terms:
23 + -7x + -2x2 = 7x + -7x + 2x2 + -2x2

Combine like terms: 7x + -7x = 0
23 + -7x + -2x2 = 0 + 2x2 + -2x2
23 + -7x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
23 + -7x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-11.5 + 3.5x + x2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + 3.5x + 11.5 + x2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + 3.5x + x2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + 3.5x + x2 = 0 + 11.5
3.5x + x2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
3.5x + x2 = 11.5

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = 11.5 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = 11.5 + 3.0625

Combine like terms: 11.5 + 3.0625 = 14.5625
3.0625 + 3.5x + x2 = 14.5625

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = 14.5625

Calculate the square root of the right side: 3.816084381

Break this problem into two subproblems by setting 
(x + 1.75) equal to 3.816084381 and -3.816084381.

Subproblem 1

x + 1.75 = 3.816084381 Simplifying x + 1.75 = 3.816084381 Reorder the terms: 1.75 + x = 3.816084381 Solving 1.75 + x = 3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = 3.816084381 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = 3.816084381 + -1.75 x = 3.816084381 + -1.75 Combine like terms: 3.816084381 + -1.75 = 2.066084381 x = 2.066084381 Simplifying x = 2.066084381

Subproblem 2

x + 1.75 = -3.816084381 Simplifying x + 1.75 = -3.816084381 Reorder the terms: 1.75 + x = -3.816084381 Solving 1.75 + x = -3.816084381 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + x = -3.816084381 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + x = -3.816084381 + -1.75 x = -3.816084381 + -1.75 Combine like terms: -3.816084381 + -1.75 = -5.566084381 x = -5.566084381 Simplifying x = -5.566084381

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.066084381, -5.566084381}

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